11. By
12. In
13. To
14. Off
15. On
16. Toward
17. By
18. On
19. In, to
20. After
The word in the scentence is " Looked" or "around", both acceptible
Well I mean the story very likely could take place in the U.S honestly. I didn't find anything distinctive of Dublin, Ireland in it. Culturally, it seems like a very busy, fast paced sort of place that values small business, what with the trolley system being very crowded and the bazaar being pretty popular. Hope this helped.
The one that would not contribute to the structure of Longfellow’s poem would be repetition of phrases. So, C.
